High pressure will remain centered over the Philadelphia and New York City metropolitan areas today with clear skies, light winds, and warm temperatures. Temperatures this afternoon will rise into well above normal levels with highs in the lower to mid 60's over the interior and mid to upper 60's in urban locations and along the coast.
The high pressure system is locked in place between Sub Tropical Storm Sean over the western Atlantic and an advancing cold front over the Plains. The advance of the cold front will be slowed by the slow moving high pressure system, which will keep mild conditions in place through tomorrow. Temperatures will continue to remain well above normal with lows in the mid 40's to lower 50's and highs in the mid to upper 60's.
By Thursday, the cold front will finally reach the northern Mid Atlantic with scattered showers throughout the region. While moderate to heavy rain is expected to develop along this cold front due to the interaction with Sub Tropical Storm Sean, the bulk of this rainfall will be focused over eastern New England and not the northern Mid Atlantic. Temperatures ahead of the cold front will rise into the 60's in the morning and early afternoon hours before crashing through the 50's and into the 40's and 30's in the late afternoon and evening hours.